Buyer's Guide · Buying a business
Is the revenue real? How to verify a seller's numbers before you sign
You verify a seller's revenue by triangulation, not trust: the P&L is the claim; the tax returns, twelve months of bank statements, and the card-processor statements are the evidence. Deposits and processed card volume should substantially retrace the revenue the P&L claims. The fastest check is a deposit tie-out, which takes about twenty minutes per year of records. Whatever the documents can't see (usually "cash sales") is revenue you should not pay a multiple on. The rule that settles every argument: price only provable revenue.
The one principle: the P&L is a claim, not proof
Every seller's P&L says the business makes money. That's what it's for. It's a sales document, assembled by the person with the strongest interest in a high number. Treating it as proof is how buyers overpay; treating it as a claim to be verified is due diligence.
Verification means triangulation. You line the P&L up against documents the seller can't easily shape after the fact: what was sworn to the IRS, what actually landed in the bank, what the card processor actually settled. Then you pay attention wherever the lines don't meet.
New to reading the claim itself? How to read a P&L when buying a business →
The four documents, and what each one proves
| Document | What it proves | The gap it exposes |
|---|---|---|
| The P&L | The seller's claim: the number every other document gets tested against. | Nothing by itself. It's the hypothesis, not the evidence. |
| Tax returns (3 years) | What the seller told the IRS under penalty of perjury. | A P&L far above the returns means someone is lying to you or to the IRS. Either way, you can't price the difference. |
| Bank statements (12 months) | What actually landed in the account, month by month. | Deposits that persistently run below claimed revenue expose the gap you're being asked to take on faith. |
| Card-processor statements | Card volume actually settled, with fees. Very hard to fake. | Claimed sales that outrun card volume plus plausible cash means the "cash" is doing suspiciously heavy lifting. |
The 20-minute deposit tie-out: a worked example
The P&L claims $85,000 a month of revenue. You total twelve months of bank deposits (excluding loan proceeds, transfers, and the owner's own top-ups) and they average $71,000 a month. The card-processor statements settle $52,000 of that. Asked about the difference, the seller says: "the rest is cash."
So $71,000 is provable, and $14,000 a month ($168,000 a year) exists only in the seller's telling. At the 2.0× to 3.5× multiples these businesses trade on, that unverifiable slice is doing $336,000 to $588,000 of work in the asking price.
You don't need to call anyone a liar. You reprice: "I'm pricing on the revenue the documents support. If more of it is real, show me where it lands." Either the paper appears, or the price comes down.
The expense-side twin of this trick is add-back padding. Add-backs: which ones are real? →
Gas station & c-store cross-checks
Fuel-and-convenience deals give you extra triangulation angles, because so much of the business leaves an independent paper trail:
- Fuel volume vs claimed fuel revenue. Supplier statements show gallons delivered. Claimed fuel revenue that outruns what those gallons could plausibly produce at market margins is a made-up number. The benchmarks are here →
- Card fees vs claimed volume. Most fuel is bought on cards, and processors charge for every swipe. Big claimed sales sitting next to strangely small processing fees means the sales aren't there.
- Lottery commissions. State lottery reports are third-party records: an easy, independent check on one revenue stream, and on the seller's general honesty.
- The register itself. POS systems and z-tapes exist precisely to record cash. A seller claiming heavy cash sales with no register history is claiming revenue their own equipment never saw.
What sellers say when you start checking
- “It's a cash business, you know how it is.”
- Cash that never hit a bank account or a tax return is invisible to every document. You can believe it exists; you just can't verify it, so you can't pay 2 to 3× for it. That's arithmetic, not an accusation.
- “The tax returns understate it. I don't report everything.”
- The seller is asking you to reward tax fraud with a higher purchase price. If the returns are the honest floor, price from the floor.
- “Trust me, the registers are busy all day.”
- Busy isn't a number. Registers produce reports; processors produce statements; banks produce deposits. If the activity is real, the paper exists.
Unverifiable revenue is the first of the six red-flag families every buyer should know. See all six →
Want the triangulation done for you?
Upload the seller's P&L, tax returns, and bank statements, and BizScore runs the cash-vs-reported check line by line, comparing what's claimed against what the documents prove, and flagging every gap with the exact source it came from.
Frequently asked
- How do I verify a seller's revenue claims?
- Triangulate the P&L against three document sets the seller can't easily reshape: the last three years of tax returns, twelve months of bank statements, and the card-processor statements. Deposits plus documented cash should substantially retrace claimed revenue. Where they don't, the difference is unverifiable. Negotiate as if it isn't there.
- What is a deposit tie-out?
- A month-by-month comparison of the revenue the P&L claims against what was actually deposited into the business bank account. Total each month's deposits (excluding loans, transfers, and owner contributions) and set them beside claimed revenue. A modest, explainable gap is normal; a large persistent one is the single most common revenue red flag.
- What if a lot of the revenue really is cash?
- Some genuinely is, and the honest version still leaves footprints: register z-tapes, deposit slips, and cash that shows up in the bank statements. The rule stays the same either way: you pay a multiple on revenue that documents can prove, and you don't on revenue that exists only in the seller's telling.
- Which documents should I demand before pricing a deal?
- Minimum set: three years of business tax returns, three years of P&Ls, twelve months of business bank statements, and twelve months of merchant (card) processor statements. For a gas station or c-store, add fuel supplier statements and lottery commission reports. A seller who resists producing these is answering your question.
About this guide
BizScore is built by first-time business buyers — people who watched someone close to them lose their life savings on a deal that looked clean on a spreadsheet and fell apart in the documents the seller never volunteered. That experience is why these guides exist, and why every BizScore report cites the exact document behind each finding.
Where the numbers come from: the benchmark ranges in our guides — SDE multiples, expense ratios, typical timelines — are widely-used industry rules of thumb, cross-checked against the analytical benchmarks BizScore applies inside its reports. Dollar figures such as a ~$15,000 quality-of-earnings review or a $5,000 deal attorney are representative of what buyers typically pay, not quotes; actual costs and multiples vary by deal. We review these figures periodically — last updated July 2026.
BizScore is an information service — think of it as a Carfax for a small business — not a CPA, an attorney, or financial advice. Use it to decide where to spend your professional dollars, and bring in a qualified professional before you sign anything.
This guide is general education, not a formal business appraisal or financial, legal, or tax advice. Every deal is different. Verify against the actual documents and talk to a qualified professional before you sign anything.